클라이언트 대시보드 통계 실지표 연동 및 백엔드 API 구현

devfront/src/lib/devApi.ts

@@ -20,6 +20,12 @@ export type ClientListResponse = {
   offset: number;
 };
 
+export type DevStats = {
+  total_clients: number;
+  active_sessions: number;
+  auth_failures_24h: number;
+};
+
 export type DevAuditLog = {
   event_id: string;
   timestamp: string;
@@ -121,6 +127,11 @@ export async function fetchClients() {
   return data;
 }
 
+export async function fetchDevStats() {
+  const { data } = await apiClient.get<DevStats>("/dev/stats");
+  return data;
+}
+
 export async function fetchClient(clientId: string) {
   const { data } = await apiClient.get<ClientDetailResponse>(
     `/dev/clients/${clientId}`,